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{{Self-reference|For the Wikipedia C1 criterion for speedy deletion, see {{slink|Wikipedia:Criteria for speedy deletion#C1}}.}}
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'''C1''', '''C01''', '''C.I''' or '''C-1''' may refer to:
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==Arts and media==
* C1, a [[note-octave]] in music
* [[C1 Television]], a Mongolian television channel
* [[Cinema One]], Philippine pay TV channel
* [[Schecter C-1 Hellraiser FR]], a guitar model
* A [[List of Yamaha products#Acoustic musical instruments|Yamaha]] grand piano model
* "C1", a slang expression in the video game ''[[Counter-Strike]]'', used to express agreement

==Biology and medicine==
=== Anatomy ===
* [[Cervical vertebra 1]], the first cervical vertebrae of the vertebral column
* [[Cervical spinal nerve 1]], a spinal nerve of the cervical segment

=== Biochemistry ===
* [[C1 complex]], the first component of the classical complement pathway
* [[C1 domain]], an important secondary messenger protein domain
* [[C1-inhibitor]], a human serine protease inhibitor
* [[C1 regulatory sequence]] for the insulin gene
* [[Apolipoprotein C1]], a human lipoprotein
* [[Chlorophyll c1]], a form of chlorophyll
* [[Cytochrome C1]], a precursor protein to Cytochrome C
* [[Proanthocyanidin C1]], a type of polyphenolic compound
* [[Prostaglandin C1]], a form of prostaglandins

=== Other uses in biology and medicine ===
* [[C1 and P1 (neuroscience)]], a component of the visual evoked potential
* [[ATC code C01]], a subgroup of the Anatomical Therapeutic Chemical Classification System
* C01, the ICD-10 code for "malignant neoplasm of base of tongue", a form of [[oral cancer]]
* C1, the short name for a microfluidic single-cell analysis system sold by [[Fluidigm#Products|Fluidigm]]

==Chemistry==
* [[C1 Chemistry]], study of methane, methanol, carbon monoxide, carbon dioxide

==Computing==
===Hardware===
* [[C-One]], a single-board microcomputer
* [[C1 NES TV]], a family of Nintendo-television-set hybrids manufactured by Sharp Corporation in 1983
* ATI C1, codename of the Xbox 360 GPU [[Xenos (graphics chip)|Xenos]]
* [[Apple silicon#Apple C1|Apple C1]], a cellular modem chip
* A type of error on a compact disc (CD), see [[Compact_disc#Integrity|Compact disc § Integrity]].

===Other uses in computing===
* [[C0 and C1 control codes]] defined in ISO 6429
* [[C1 (protocol)]], a 1984 protocol for file transfer, also known as "Punter"
* [[TCSEC]] C1 security class
* A CPU power state in the [[Advanced Configuration and Power Interface]]

==Mathematics==
* <math>C^1</math>, the set of all [[continuously differentiable]] functions
* [[C1 field]], a quasi-algebraically closed field
* C1, the first of four pure modules taken in the [[Advanced Level (UK)]] Maths syllabus

==Transportation==
===Air===
* [[C-1 Trader]], a cargo-version of the S-2 Tracker anti-submarine warfare aircraft of the United States Navy
* [[AEG C.I]], a German World War I reconnaissance aircraft
* [[AGO C.I]], a 1915 German reconnaissance biplane
* [[Albatros C.I]], a 1915 German two-seat general-purpose biplane
* [[Aviatik C.I]], a 1915 German observation plane
* [[Cierva C.1]], a 1920 Spanish experimental autogyro
* [[DFW C.I]], a WWI German reconnaissance aircraft
* [[Douglas C-1]], a cargo/transport airplane produced by Douglas Aircraft for the U.S. Army Air Service starting in 1925
* [[Fokker C.I]], a 1918 German reconnaissance biplane
* [[Friedrichshafen C.I]], a 1914 German single-engined amphibious reconnaissance biplane
* [[Hansa-Brandenburg C.I]], a 1916 German 2-seater armed single-engine reconnaissance biplane
* [[Kawasaki C-1]], an indigenous transport aircraft of the Japanese Air Self-Defense Forces
* [[Otto C.I]], a 1915 German reconnaissance biplane
* [[Rumpler C.I]], a 1915 German two-seater single-engine reconnaissance biplane
* [[Southern Cross Airport (New Jersey)]] (FAA LID: C01)

===Land===
====Routes====
* [[Circumferential Road 1]] or C-1, an arterial road of Manila, Philippines
* [[London Buses route C1]]
* [[Route C1 (Shuto Expressway)]], the Inner Loop of Tokyo's Shuto Expressway system
* Claro M. Recto Avenue, a [[Major roads in Metro Manila|road in Metro Manila]], Philippines
*[[Massachusetts State Route C1]]

====Land vehicles====
* [[BMW C1]], a cabin scooter
* [[Chevrolet Corvette C1]], first generation sold from 1953 to 1962, denoted a solid-axle rear-end
* [[Citroën C1]], a small car
* [[Ford C1 platform]], the Ford Motor Company's global compact car automobile platform
* [[Leapmotor C01]], a battery electric executive sedan
* [[Lit C-1]], a prototype cabin motorcycle
* [[Nimrod NRA/C1]], a 1981 test design racing car
* Sauber C1, a [[Sauber]] sport car

====Other uses in land transport====
* C-1, the numberplate of the [[Prime Minister of Australia]]'s official VIP transportation
* A type of [[heavy goods vehicle]] licence
* A one-way traffic sign in the [[Vienna Convention on Road Signs and Signals]]

===Rail===
* [[Bavarian C I]], an 1847 German steam locomotives class
* [[GNR Class C1 (small boiler)]], a British 4-4-2 steam locomotive class (classified C2 during LNER ownership)
* [[GNR Class C1 (large boiler)]], a British 4-4-2 steam locomotive class
* [[LB&SCR C1 class]], an 1882 British freight steam locomotive
* [[C1 (railcar)|Long Island Rail Road C1]], a bilevel railcar built by Tokyu Car Corporation
* [[NER Class C1]], a British 0-6-0 steam locomotive class
* [[PRR C1]], an American PRR steam locomotive
* [[Finnish Steam Locomotive Class C1]]

===Sea===
* {{HMS|C1}}, a C-class submarine of the Royal Navy
* {{USS|C-1|SS-9}}, a C-class submarine of the United States Navy
* {{USS|Newark|C-1}}, a protected cruiser of the United States Navy
* [[Type C1 ship]], a small cargo vessel built by the United States in large numbers before and during World War II
* ''[[Isaac Peral]]'' (C-1), a Spanish submarine

===Space===
* [[Cluster II (spacecraft)#Mission overview|Cluster 1]], also known as Rumba, an ESA satellite

==Sports==
{{for|racing cars|#Land vehicles}}
* C1, a solo [[canoe]] discipline including [[sprint canoe]] and [[canoe slalom]]
* [[C1 (classification)]], a para-cycling classification
* C1, an abbreviation for Class One [[offshore powerboat racing]]
* 'C1', the top category in [[Group C]] sportscar racing, used between 1985 and 1990
* C1, the [[UEFA Champions League]] (formerly known as the European Cup) in football
** [[Serie C1]], the third highest football league in Italy until 2008

== Other uses ==
* C1, an international standard paper size defined in [[ISO 216]] (648×917&nbsp;mm)
* [[Bills C-1 and S-1]], a ''pro forma'' bill normally introduced at the start of a parliamentary session in the Canadian House of Commons
* C1, also known as [[Vlakplaas]], a unit of the South African Police responsible for assassinating opponents of Apartheid during the 1980s
* C1, a level in the [[Common European Framework of Reference for Languages]]
* C1, the use class for hotels, in [[town and country planning in the United Kingdom]]
* C1, a [[NRS social grade]] in the United Kingdom for the lower middle class
* a 2001 1.3 megapixels [[List of Olympus products#Digital cameras|Olympus digital camera]] model
* a [[List of North American broadcast station classes#FM|class of FM radio broadcasting in North America]]
* [[C1 pylon]], a type of high voltage pylon
* Caldwell 1 ([[NGC 188]]), an open cluster in Cepheus
*[[C-1 visa]], a type of visa for individuals transiting through the United States
* [[C1 Espresso]], café in Christchurch, New Zealand
* [[Capital One]], an American banking company

==See also==
* [[Cl (disambiguation)]]
* [[CI (disambiguation)]]
* [[1C (disambiguation)]]

{{Letter–number combination disambiguation}}